The rubber disc check valve is composed of valve body, valve cover and rubber flap. The rubber flap is made of steel plate and reinforced nylon cloth, and the outer layer is covered with rubber. The service life of the valve disc can reach 1 million times. Rubber check valve adopts full flow area design, which has the characteristics of small head loss, not easy to accumulate debris and easy to maintain. It is mainly suitable for water supply and drainage system. It can be installed at the outlet of the water pump to prevent the damage of backflow and water hammer to the water pump and pipeline. It can also be installed on the bypass pipe of the water inlet and outlet pipe of the reservoir to prevent the pool water from flowing back into the water supply system.